WS308 Product Description Features General Description ■Adaptive current ripple eliminating WS308 is applied for LED lighting driver, can eliminate the ■Adjustable LED current ripple range current ripple produced by preceding driver. ■Settable LED voltage maximum With WS308 and preceding high power factor constant current control circuit, can realize no-stroboscopic high power factor LED constant current solution. Applications ■LED lighting Typical Application Circuit VC 2 OUT 3 GND WS308 1 Pin Definition and Device Marking WS308 is available in TO252，as shown below： WS308 VC 1 OU T GN D 2 3 TO252 WT-D050-Rev.A0 Feb.2015 WS308_EN WS308 Product Description Pin Function Description Pin Pin Name Number VC 1 Ripple eliminating circuit control OUT 2 Ripple eliminating circuit output GND 3 Ground. Function Description Ordering Information Package TO-252, IC Marking Information Purchasing Device Name WS308DP WS308DP Pb-free Note: Maximum practical continuous power in an Adapter design with sufficient drain pattern as a heat sink, at 50℃ ambient. Absolute Maximum Ratings Symbol Parameter Value Unit OUT pin voltage -0.3~20 V VC VC pin voltage -0.3~10 V TA Operation temperature -20~125 ℃ Tstg Storage temperature -40~150 ℃ Rθja Thermal resistance 65 ℃/W VOUT Note: Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated in the Recommended Operating Conditions section are not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability. Electrical Characteristics (TA=25℃, if not otherwise noted) Symbol Parameter SPEC Test condition Min IOUT OUT pin output current VOUT OUT Pin saturation voltage ICLMT OUT Pin limit current WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI Typ Unit Max 0.3 LED current is 160mA MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI 0.3 MICROELECTRONICS Fax : +86-755-8250 6299 0.45 WINSEMI MICROELECTRONICS A 0.65 V 1 A WINSEMI MICROELECTRONICS 2/5 WS308 Product Description Function Description WS308 is applied for LED lighting driver, can eliminate the current ripple produced by preceding driver. With WS308 and preceding high power factor constant current control circuit, can realize no-stroboscopic high power factor LED constant current solution. PCB layout notes for use Copper layout for better heat dissipation，adding via hole ： WS308 OUT Pin need copper layout for better heat dissipation（If the Two-sided board，the Copper is needed both top and bottom layer）,can made by interwoven fibers or linear copper clepsydra, for reducing the chip temperature and enhancing system performance. Two-sided board PCB heat dissipation，the via hole between top and bottom layer should be as many as possible for heat dissipation requirement. Typical Application Solution Q1 R1 R3 C1 R4 1 VC 2 OUT 3 GND R5 WS308 R2 U1 BOM list Station number R1 Parameter Station Parameter Station Parameter 300R/0805 R4 10K/0805 C1 100uF/10V R2 5.1K/0805 R5 2.2R/1206 U1 WS308 R3 10K/0805 Q1 S8550 WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 3/5 WS308 Product Description Package Information TO-252 Package Information Unit:mm E A F 符号 symbol MIN MAX A 2. 1 2. 5 b 0.66 0. 86 c 0 . 458 0.558 D 5. 9 6. 3 D1 0 . 702 1.002 E 6. 4 6. 8 E1 5 . 12 5 . 52 D D1 E1 G L e b c e WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI 2 . 286TYP F 0 . 458 0.558 G 0.9 1.1 L 0. 6 1. 0 L1 2.548 3.148 MICROELECTRONICS WINSEMI MICROELECTRONICS 4/5 WS308 Product Description NOTE: 1.We strongly recommend customers check carefully on the trademark when buying our product, if there is any question, please don't be hesitate to contact us. 2.Please do not exceed the absolute maximum ratings of the device when circuit designing. 3.Winsemi Microelectronics Co., Ltd reserved the right to make changes in this specification sheet and is subject to change without prior notice. CONTACT: Winsemi Microelectronics Co., Ltd. ADD:Room 1002, East, Phase 2, HighTech Plaza,Tian-An Cyber Park,Chegongmiao, FuTian, Shenzhen, P.R. China Post Code : 518040 Tel : +86-755-8250 6288 FAX : +86-755-8250 6299 Web Site : www.winsemi.com WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 5/5